763 	struct usbvision_frame *frame;  in vidioc_querybuf()  local
771 	frame = &usbvision->frame[vb->index];  in vidioc_querybuf()
772 	if (frame->grabstate >= frame_state_ready)  in vidioc_querybuf()
774 	if (frame->grabstate >= frame_state_done)  in vidioc_querybuf()
776 	if (frame->grabstate == frame_state_unused)  in vidioc_querybuf()
787 	vb->timestamp = usbvision->frame[vb->index].timestamp;  in vidioc_querybuf()
788 	vb->sequence = usbvision->frame[vb->index].sequence;  in vidioc_querybuf()
795 	struct usbvision_frame *frame;  in vidioc_qbuf()  local
802 	frame = &usbvision->frame[vb->index];  in vidioc_qbuf()
804 	if (frame->grabstate != frame_state_unused)  in vidioc_qbuf()
808 	frame->grabstate = frame_state_ready;  in vidioc_qbuf()
809 	frame->scanstate = scan_state_scanning;  in vidioc_qbuf()
810 	frame->scanlength = 0;	/* Accumulated in usbvision_parse_data() */  in vidioc_qbuf()
815 	frame->v4l2_format = usbvision->palette;  in vidioc_qbuf()
818 	list_add_tail(&usbvision->frame[vb->index].frame, &usbvision->inqueue);  in vidioc_qbuf()
843 		       struct usbvision_frame, frame);  in vidioc_dqbuf()
978 	struct usbvision_frame *frame;  in usbvision_read()  local
1006 		frame = &usbvision->frame[i];  in usbvision_read()
1007 		if (frame->grabstate == frame_state_unused) {  in usbvision_read()
1009 			frame->grabstate = frame_state_ready;  in usbvision_read()
1010 			frame->scanstate = scan_state_scanning;  in usbvision_read()
1012 			frame->scanlength = 0;  in usbvision_read()
1015 			frame->v4l2_format = usbvision->palette;  in usbvision_read()
1018 			list_add_tail(&frame->frame, &usbvision->inqueue);  in usbvision_read()
1037 	frame = list_entry(usbvision->outqueue.next,  in usbvision_read()
1038 			   struct usbvision_frame, frame);  in usbvision_read()
1043 	if (frame->grabstate == frame_state_error) {  in usbvision_read()
1044 		frame->bytes_read = 0;  in usbvision_read()
1050 	       frame->index, frame->bytes_read, frame->scanlength);  in usbvision_read()
1053 	if ((count + frame->bytes_read) > (unsigned long)frame->scanlength)  in usbvision_read()
1054 		count = frame->scanlength - frame->bytes_read;  in usbvision_read()
1056 	if (copy_to_user(buf, frame->data + frame->bytes_read, count))  in usbvision_read()
1059 	frame->bytes_read += count;  in usbvision_read()
1062 	       (unsigned long)count, frame->bytes_read);  in usbvision_read()
1066 		frame->bytes_read = 0;  in usbvision_read()
1069 		frame->grabstate = frame_state_unused;  in usbvision_read()
1120 	pos = usbvision->frame[i].data;  in usbvision_mmap()